Link to FAQ if Certificate is not available (EXPOSUREAPP-7846) (#3454)

* Added labId to test objects and server response

* Added new exception state and strings for dialog

* Extended CertificateData classes with labId field

* Added logic to TestCertificateRepository to add labId to certificate in requestCertificate
and check if its valid in refresh

* Enhanced error processing in CertificatesFragment to display faq link when relevant and human readable exception text

* Fixing unittests

Co-authored-by: BMItter <Berndus@gmx.de>
Co-authored-by: harambasicluka <64483219+harambasicluka@users.noreply.github.com>
Co-authored-by: chris-cwa <69595386+chris-cwa@users.noreply.github.com>